what we call when a line joins the centre of curvature and the pole of curved surfaces?
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Principal Axis
Explanation:
A line joining the center of curvature and the pole of curved surfaces is called Principal Axis. This line is exactly perpendicular to the surface of the mirror. It is also known as the 'normal'.
The central point of the reflecting spherical surface is known as Pole. It is represented by (P).
The center of the hollow sphere of which the mirror forms a part is known as Centre of Curvature. It is represented by (C).
Incident rays parallel to the principal axis or appear to meet after reflection is called as Principal Focus. It is represented by (F).
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